: a heat engine (such as a steam engine) that derives its heat from fuel consumed outside the cylinder
Examples of external combustion engine in a Sentence
Recent Examples on the WebNo operating or using any internal or external combustion engine without a spark arresting device.
Scott D. Pierce, The Salt Lake Tribune, 14 June 2021
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'external combustion engine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.